Get help using Back to My Mac

Update your software

Check your settings and connections

Make sure you're signed in to iCloud with your current Apple ID. If you changed your password but didn't update it in iCloud preferences on either computer, Back to My Mac won’t connect.

Make sure Back to My Mac is turned on. Choose System Preferences from the Apple menu and click iCloud. In iCloud preferences, make sure Back to My Mac is selected and review any status messages. If Back to My Mac is selected, deselect it, then select it again.

On the Mac you're trying to connect to:

In Energy Saver preferences, make sure your Mac isn't in sleep mode. Set it to either Wake on Demand or never go to sleep.